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We report on a search for the free decay component of pi- stopped in waterand light materials. A non-zero value of this would be an indication ofanomalous nu_e contamination to the nu_e and nu_mu_bar production atstopped-pion neutrino facilities. No free decay component of pi- was observedin water, Beryllium, and Aluminum, for which upper limits were established at8.2E-4, 3.2E-3, and 7.7E-3, respectively

Search for free decay of negative pions in water and light materials